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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47b44026842e4707432c9044e81611addf96d005f066c77994cd8e880b058a1e' 
  AND token = 'Pe5kpWQRmdVTz2kyh9q+Se5rss4cEcNWOLJwGDZXeIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}